<?php
$age = $_GET['age'];
if($age < 2 && $age >0){
  echo "yinger";
}else if($age < 18 && $age >=2){
  echo "teenger";
}else if($age < 30 && $age >=18){
  echo "chengnian";
}else if($age < 50 && $age >=30){
  echo "laonian";
}else{
  echo "laonian";
}
?>
